Drill chuck



,Oct. 16 1923. 1,471,271

' c. B. LONG A DRILL CHUCK Filed y 28. 1921 CHARLES BOMBERGEB LONG, O LANCASTER, PENNSYLVANIA, ASSIGNOB TO CHAM- PION BLOWER 6:, FORGE COMPANY, OF LAN ASTER,'PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

DRILL Application filed May 28,

T 0 ME whom it may concern:

Be it known that I, CHARLES E. LONG, a citizen of the United States, residing at Lan caster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Drill Chucks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My inventionrelates to what are com monly known as drill chucks, and more particularly to a chuck adapted to firmly grip and hold the shank of a drill or other tool during the operation of drilling or the like.

The objects of my invention are to provide an improved drill chuck of substantial construction adaptedto be easily manipulated for gripping or releasing a tool, and consisting of few simple and inexpensive parts so constructed and arranged that they may be readily removed and replaced by an unskilled mechanic, when in need of repair or for other cause, and which is not liable to get out of order or to be easily broken.

The invention will first be hereinafter more particularly described, with reference to the accompanying drawings which are to be taken as a part of this specification, and then pointed out in the claims at the end of the description.

In said drawings,

Fig. 1 is a perspective view of a chuck embodying my invention;

Fig. 2 is a longitudinal sectional view of the same;

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2;

Fig. 4c is a longitudinal sectional view of the jaw-carrying member showing two of the jaws in normal position; and

Fig. 5 is a detail fragmentary view illustrating the method of mounting the jaws.

Referring to said drawings, in which the same reference characters are used to denote corresponding parts in different views, 1 denotes a cylindrical body or sleeve having an inwardly projecting annular flange 1 and internally threaded as at 1 ,.to receive a tightening nut 5 having an axial bore 5". A series of spaced annular knurled portions 1 may be provided on the outer surface of the cylindrical body to facilitate CHUCK.

1921. Serial No. 473,476.

turning the same when gripped by the hand of the operator. V1th1n the cylindrical body or sleeve 1, is placed a aw-carrying head or member 2, preferably of cylindrical v which fits snugly within the annular flange 1 on the sleeve 1, whereby it is centered in said sleeve with its outer end substantially flush with the outer surface of said flange. An annular ball retainer and separator of ordinary construction from which the balls project in a well known manner in three directions is placed in the ball-race 2% so that the balls may contact with the inner surface of the sleeve 1 and with the flange l so as to reduce friction tow a minimum when the jaw-carrying head is caused to rotate with the tightening nut, when said nut is turned in sliding contact with the gripin 'aws in securin a firm hold on the drill or other tool, and when turned in a reverse direction to release the hold of the jaws on the tool. The member 2 is formed.

or provided with three, more or less, radial slots 2, which are preferably equidistantly spaced and in said slots are fitted an equal number of jaws l, which are rockingly mounted on the member 2 by means or" angu lar levers 2 tulcrumed at the angle or bend therein on the member 2 as at E2 and having one arm Q arranged to project into a socket 4 in one side of the jaw, while the other arm thereof is secured to one end of a spring 2 the other end of which is attached to the member 2 by means of a set screw or pin 2 so that said springs tend normally to force the jaws radially outwardly and to yieldingly resist inward movement thereof. The outer surfaces of the jaws 4 are beveled or inclined inwardly from an intermediate point to their rear ends while their forward ends 6 are reversely inclined at an obtuse angle to the axis of the head 2, and the bottoms of the slots 2 are correspondingly inclined so that the tendency of the jaws when resting upon said inelinedbottoms in a vertical position is to move inwardly in opposition to the'pressure exerted by the springs 2 through the levers 2, and when the tightening nut is screwed inwardly so as to contact with the inclined. surfaces of said jaws they will be caused to more i tact with the tool their entire length and to firnil grip and center the tool in the axial line of the chuck. Thejaws hare biting edges extending the full length thereof parall l with the axes of the m inliers 1 and as their outer edges are inclined or new eled toward the axis or the body so as to provide extended hearingfaces in'sliding Contact with the corres Jon ly beveled end inserted thru the bore 2 between e an; the jaws may be released jeinoveii ner ends Troin to disengage their rou the sockets in the si Having thus descrined my in .e

claim as new and desire to seem ters F'atent oi the United States i 1. in a chuck a cylindrical hod lnble jaw-carrying member withi carrying; radially slidalile jaws gly mounted thereon for clampinga tool therebetween, each jaw having a socket in one side thereof and supports for said j aws pivoted intermediate their ends to said member so that in assembling or disassembling the chuck one end of the support may swing -Jardly into con into and out of enga went with in the adjacent jaw, springs acting on tiie free ends of said supports tending to i i the aws apart and a nut screwed into said. body and adapted to operate said jaws for clamping a tool therehetween.

in a chuck, longitudinally and rsdia slidable jaws for clamping a tool, said jaws each having a socket in one side thereoi and mounted on pivotal supports, said supports comprising elh w-levers pivoted on the jawcarrying member and having the free end 0 one arm of each lever movable into and out of engagement with a socket in one Oi saiu jaws for pivotally supporting it in on erative position and permitting; it to be detached, and springs acting on said lever? tending}; to move said aws apart.

3. A chuck comprising; a cylindrical bod enclosinga revoluhle tool receiving menr her, said member having sidewiseniorable jaws mounted on intermediatei pivoted supports carried by said member and adapted to swingion their pivots so as to cause end thereof to move into and out oi pivotal engagement with anadjaeent jaw, a nut tor actuating said jaws means tendin to move the jaws apart, and means to preventhinding contact of said jaw-carrying ember when said jaws are caused to grip a tool.

in the presence of two witnesses.

CHARLES BQMBEBGER LON li lsnesses ARTHUR SMrrL.

in testimon whereof I atiix m T si nature 

